HOUSTON, May 2, 2012 /PRNewswire/ -- With the summer driving season fast approaching and many Americans contemplating hitting the road, Shell teamed up with John and Helen Taylor, known as the world's most fuel-efficient couple, during their latest record-breaking drive to demonstrate how motorists can stretch their fuel while on the road. During their 21-day fuel-efficiency trip throughout the 48 contiguous U.S. states, the Taylors achieved an average of 69.985 U.S. miles per gallon in an unmodified hybrid gasoline vehicle using tips from the Shell Smarter Driving Program. (Photo: http://photos.prnewswire.com/prnh/20120502/DA98897) The Taylors will celebrate this accomplishment and share their tips and experiences at the "Shell Smarter Mobility Day" in Houston on May 2 at 12:15 P.M. CDT at Houston City Hall. At that time, Shell will receive a Mayoral Proclamation from the City of Houston, presented by Laura Spanjian, Director of Sustainability, to Selda Gunsel, Vice President, Shell Global Commercial Technology. "Helen and I have been testing fuel efficiency for the last 30 years so we know first-hand there are easy ways for everyone to travel while also using fuel more efficiently. The Shell Smarter Driving program helps folks stretch their fuel farther on the road. It certainly did for us as we drove through all 48 states," said John Taylor. The Taylors showed that when drivers make smart decisions, they can improve mileage and savings at the pump with proper car maintenance, behaviors, and actions and products. For the Taylors, that meant keeping the car well maintained and the tires properly inflated, avoiding idling and using high-quality gasoline and lubricants. The Taylors made their 9,032.7-mile trip using New Shell Nitrogen Enriched Gasolines exclusively from Shell stations along their route. Before and during their trip, the Taylors also stopped at a Jiffy Lube to inspect, fill and clean essential components of their car to keep it running smoothly, including putting Pennzoil Platinum® 0W20 under the hood, a full-synthetic motor oil for hybrid engines.